CN103624357B - 一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法 - Google Patents
一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法 Download PDFInfo
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005304 joining Methods 0.000 title claims abstract description 15
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 12
- 238000006056 electrooxidation reaction Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 title claims abstract description 12
- 229910000679 solder Inorganic materials 0.000 claims abstract description 54
- 238000003466 welding Methods 0.000 claims abstract description 48
- 238000005219 brazing Methods 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 230000004907 flux Effects 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 6
- 238000007654 immersion Methods 0.000 claims abstract description 3
- 238000007747 plating Methods 0.000 claims abstract description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 39
- 239000010962 carbon steel Substances 0.000 claims description 38
- 239000011592 zinc chloride Substances 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical group [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 229910052718 tin Inorganic materials 0.000 abstract description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 16
- 239000010949 copper Substances 0.000 description 14
- 229910052802 copper Inorganic materials 0.000 description 13
- 238000002844 melting Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000000155 melt Substances 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 238000004021 metal welding Methods 0.000 description 8
- 238000005476 soldering Methods 0.000 description 7
- 239000010953 base metal Substances 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 229910005382 FeSn Inorganic materials 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910005391 FeSn2 Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
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- 239000000945 filler Substances 0.000 description 2
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- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 229910000926 A-3 tool steel Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
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- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
- B23K35/262—Sn as the principal constituent
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
本发明属于金属连接领域,具体涉及一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法。本发明提供的一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法通过将低碳钢试样打磨、洗净后预热,利用加热板将试样加热到240℃~260℃,将混合钎剂布撒到母材打磨后的焊接位置,同时将钎料持续送入焊接位置的熔化液滴中,将浸镀过焊锡的紫铜导线直接插入低碳钢试样焊接位置的焊锡液滴,润湿形成完整的接头,待液滴完全凝固后,可静置冷却至室温得到。本发明提供的连接方法相较于传统焊接方式,具有设备简单、原料简单、工艺简便、焊接温度低等优点。利用本发明提供的连接方法得到的焊接接头具有电阻率低,接头的可重复性好的优良性能。
Description
【技术领域】
本发明属于金属连接领域,具体涉及一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法。
【背景技术】
为了研究金属材料,尤其是碳钢等黑色金属材料的电化学腐蚀过程发生的原因及规律,常采用电化学腐蚀试验,进行极化曲线测量。一般需用石蜡对试样进行蜡封,在试样上留出1cm2面积进行测试,此外,试样还需采用导线与电化学工作站进行连接,连接接头金属的暴露位置同样需要进行蜡封。
在对碳钢等铁基材料进行制样的过程中,往往需要将铁基材料与紫铜导线进行连接。在金属连接过程中,尤其是在非承载结构的连接中,常常采用钎焊进行连接。钎焊是采用比母材熔点低的金属材料作钎料,将焊件和钎料加热到高于钎料熔点,低于母材熔化温度,利用液态钎料润湿母材,填充接头间隙并与母材相互扩散实现连接焊件的方法。既能够保证接头质量,又能够保证连接工艺基本不影响母材性能。目前常用的连接方式除焊接外,还存在压接、钻孔等连接方式。压接则主要依靠机械力对试样间进行材料的物理连接,其电阻率往往由于压接力的不同、卡具不同而存在较大差异,从而导致极化曲线的差异;钻孔连接同样存在重复性差、连接电阻率不稳定等缺陷。因此,采用焊接方式,最为可靠,而钎焊由于其设备小巧、连接稳定、连接头电阻率低等优势,成为最为适宜导通接头的连接方式。
美国焊接学会(AWS)规定,当钎料液相线温度高于450℃,属于硬钎焊,低于450℃,则属于软钎焊,而我国一般以350℃作为分界线。对于碳钢等材料连接,通常采用电弧焊、硬钎焊进行连接,此类连接方法焊接温度高,热影响区大,而且往往由于热源温度高,导致试样的烧蚀和涂层的破坏等。此外,由于热影响,还会造成晶粒长大、组织变化等现象,对测量材料的极化曲线的准确度造成一定影响。
针对碳钢母材,其相转变最低温度为727℃,因此,焊接过程若想基本不影响母材性能,应保证焊接温度低于727℃。因此若采用钎焊连接碳钢基体与紫铜导线,应满足焊接温度低于727℃。此外,碳钢材料的再结晶温度一般在0.4Tm,以Q235钢(A3钢亦属此类)为例,其碳含量在0.2左右,其熔点温度为1500℃左右(1495~1538℃),则再结晶温度在600℃左右,在此温度以下则不易出现新的等轴晶。
异种材料焊接以Cu母材与碳钢母材为例,如采用钎焊,则需钎料与两种母材均能润湿,并发生反应,生成化合物。现在针对上述两种母材,多采用电弧焊或硬钎焊方法。如《现代焊接》碳钢与紫铜的焊接工艺研究中,记述了采用Ag50CuZnCd钎料进行钎焊,钎焊温度>800℃;此外,还有采用H62黄铜钎料进行焊接的。但上述钎料均为硬钎焊,不能满足保持原有母材相和组织的要求,若要保持碳钢组织,应将钎焊温度降低到600℃以下。而采用软钎焊则更为合适。但目前,仅铜基、镍基等材料可通过软钎焊进行连接。而碳钢与铜的软钎焊连接未见报道。
【发明内容】
为克服上述碳钢与紫铜通过传统工艺焊接过程中存在的不足,本发明提供了一种低温连接碳钢与紫铜异种材料的方法,降低了接头电阻率以及连接工艺对于母材的热影响,保证接头的良好性能。
为实现上述目的,本发明采用以下技术方案:
本发明提供了一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法,包括制样和测试步骤,其中制样包括将试样与导线的低温连接,其中低温连接包括下述步骤:
1).备样:将净化打磨后碳钢试样烘干后用电热板将碳钢试样预热并保持在240℃~260℃,并于碳钢试样上布撒混合钎剂和钎料;碳钢试样的上下表面为平行面,碳钢试样打磨的粗糙度为3.2微米以下。
2).焊接导线:将经浸镀处理的紫铜导线同经步骤1)处理的碳钢试样接触,冷却至室温,即得。
本发明提供的一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法中,碳钢母材的碳含量≤0.3%;采用的混合钎剂的熔点为180℃~249℃,混合钎剂由ZnCl2和NH4Cl组成,混合钎剂中NH4Cl的质量百分比为16%~26%;钎料为软钎料中的Sn钎料或Sn-3.5Ag。
本发明中先将碳钢母材切割成块体或薄片试样(如直径为5mm~20mm的圆柱或长方体试样,薄片试样亦可)以满足电化学试验应用,将试样上下表面加工为平行面,须将试样焊接位置打磨为表面粗糙度3.2微米以下,可单个试样加热或小批量试样加热;焊接前,应将电热板表面清理干净,无残渣、液体或易挥发物残留。随后进行预热;首先,将电热板预热到232℃以上温度,采用的加热板的控温精度为1℃,减少了在加热过程中温度骤变对整个母材的影响,使得钎料持续熔化并充分润湿母材,保证了最终焊接头具有良好的性能;并保证母材具有一定的过热度,根据相图可知,当Sn的加热温度达到232℃以上10~15℃便可出现液相,熔化后的Sn可与母材迅速反应。母材金属中的Fe与Sn生成FeSn和FeSn2两种成分固定的稳定化合物,利用这一原理,可以满足Fe相与FeSn(FeSn2)相与Sn相的稳定过渡,即满足Sn与铁基母材的润湿,并形成分子结合。最终形成稳定的接头。钎料的选择上,较软钎料中的铅基、锌基等钎料而言,纯Sn或Sn-3.5Ag的使用,使得最终制得的接头在性能上更优良。
由于无防护(覆盖层、气氛)的Fe基材料在加热中极易氧化,故而温度不宜过高,当温度超过200℃即会发生明显氧化。在抛光的焊接位置出现棕黄色氧化层,随加热时间延长或温度升高,氧化量逐渐增大。焊接过程中,可用红外测温仪测量试样温度,当试样温度达到232℃以上温度并保证一定过热度后,将助焊剂添加到母材焊接面上,同时用焊锡丝直接接触铁基母材焊接位置,待焊丝熔化,助焊剂在液态锡覆盖下逐渐清除焊接表面的氧化物,由于液态锡覆盖,阻止了助焊剂的迅速挥发,保证了助焊剂对表面的清洁作用。随着焊接表面净化以及Fe与Sn反应的完成,钎料逐渐与基体润湿,并逐渐铺展,当润湿角大于90°后,即可认为在基体Fe与钎料Sn之间生成了FeSn(FeSn2)过渡层,从而完成母材的反应,随后,可将试样从电热板上移除,在试样台静置。
与现有技术相比,本发明具有以下有益效果:
1)设备简单:仅用电热板即可完成纯铜与碳钢的异种材料连接;
2)原料简单:所用原料均可通过市售获得,仅需ZnCl2,NH4Cl,纯Sn焊锡丝;
3)工艺简便:通过现有钎料选择、焊接温度控制、钎剂配比优化即可获得良好的焊接接头;
4)焊接温度低:避免了通过硬钎焊连接带来的高温,将焊接温度控制在300℃以下,热影响区小,远低于碳钢的退火温度,对母材微观组织及性能影响小;
5)焊接接头性能优良:得到的焊接接头电阻率低,接头的可重复性好。
【具体实施方式】
实施例1
母材采用Q235碳钢,切割为直径10mm,高度10mm圆柱,紫铜导线直径1mm,钎料采用纯Sn钎料进行焊接,钎剂采用“松香”进行助焊,钎剂的熔点温度为:135℃。首先将试样加热到245℃,将钎剂布撒到母材焊接位置,同时将钎料持续送入接触位置的熔化液滴,随焊丝不断熔化,液滴逐渐变大,钎剂先于钎料熔化,随后进行导线焊接,冷却至室温,形成接头。
实施例2
母材采用Q235碳钢,切割为直径10mm,高度10mm圆柱,紫铜导线直径1mm,钎料采用纯Sn钎料进行焊接,钎剂采用ZnCl274%,NH4Cl26%,熔点温度为:180℃,首先将试样加热到235℃,将钎剂布撒到母材焊接位置,同时将纯Sn持续送入接触位置的熔化液滴,随焊丝不断熔化,液滴逐渐变大,钎剂先于钎料熔化,随后进行导线焊接,冷却至室温,形成接头。
实施例3
母材采用Q235碳钢,切割为直径10mm,高度10mm圆柱,紫铜导线直径1mm,钎料采用纯Sn钎料进行焊接,钎剂采用ZnCl284%,NH4Cl16%,熔点温度为:249℃,首先将试样加热到255℃,将钎剂布撒到母材焊接位置,同时将Sn-3.5Ag持续送入接触位置的熔化液滴,随焊丝不断熔化,液滴逐渐变大,钎料先于钎剂熔化,随后进行导线焊接,冷却至室温,形成接头。
实施例4
母材采用Q235碳钢,切割为直径10mm,高度10mm圆柱,紫铜导线直径1mm,钎料采用纯Sn钎料进行焊接,钎剂采用ZnCl290%,NH4Cl10%,熔点温度为:240℃,首先将试样加热到230℃,将钎剂布撒到母材焊接位置,同时将铅基钎料持续送入接触位置的熔化液滴,随焊丝不断熔化,液滴逐渐变大,钎料钎料均未熔化,随后进行导线焊接,冷却至室温,形成接头。
实施例5
母材采用Q235碳钢,切割为直径10mm,高度10mm圆柱,紫铜导线直径1mm,钎料采用纯Sn钎料进行焊接,钎剂采用ZnCl290%,NH4Cl10%,熔点温度为:240℃,首先将试样加热到240℃,将钎剂布撒到母材焊接位置,同时将Sn持续送入接触位置的熔化液滴,随焊丝不断熔化,液滴逐渐变大,钎剂与钎料几乎同时熔化,随后进行导线焊接,冷却至室温,形成接头。
实施例6
母材采用Q235碳钢,切割为直径10mm,高度10mm圆柱,紫铜导线直径1mm,钎料采用纯Sn钎料进行焊接,钎剂采用ZnCl284%,NH4Cl16%,熔点温度为:249℃,首先将试样加热到240℃,将钎剂布撒到母材焊接位置,同时将Sn-3.5Ag持续送入焊接位置的熔化液滴中,随焊丝不断熔化,液滴逐渐变大,钎料先于钎剂熔化,随后进行导线焊接,冷却至室温,形成接头。
实施例7
母材采用Q235碳钢,切割为直径10mm,高度10mm圆柱,紫铜导线直径1mm,钎料采用Sn3.5Ag共晶钎料进行焊接,钎剂采用ZnCl290%,NH4Cl10%,熔点温度为:240℃,首先将试样加热到240℃,将钎剂布撒到母材焊接位置,同时将锌基钎料持续送入接触位置的熔化液滴,随焊丝不断熔化,液滴逐渐变大,钎料先于钎剂熔化,随后进行导线焊接,冷却至室温,形成接头。
依据上述1~7各实施例中均对Q235碳钢打磨至表面粗糙度为3.2微米以下,先用氢氧化钠清洗,随后用丙酮清洗后烘干,预热至250℃后进行碳钢试样母材反应和与紫铜导线焊接。将1~7各实施例中的碳钢(直径10mm,高度10mm圆柱)、紫铜导线直径(1mm,长20cm)、接头组成的导体进行电阻测量,对比各实施例的导电性能,每实施例制作6组平行式样,取平均值。所得电阻结果见表1所示。
各实施例焊接结果如表1所示:
表1各实施例焊接结果
Claims (3)
1.一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法,所述低温连接包括下述步骤:
1).备样:将净化打磨后碳钢试样烘干后用电热板将碳钢试样预热并保持在240℃~255℃,并于碳钢试样上布撒混合钎剂和钎料;
2).焊接导线:将经浸镀处理的紫铜导线同经步骤1)处理的碳钢试样接触,冷却至室温,即得;
所述碳钢试样的母材的碳含量≤0.3%;
所述混合钎剂由ZnCl2和NH4Cl组成,混合钎剂中NH4Cl的质量百分比为16%;
所述钎料为软钎料;
所述软钎料为纯Sn钎料或Sn-3.5Ag。
2.如权利1所述的一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法,其特征在于:所述混合钎剂的熔点为180℃~249℃。
3.如权利1所述的一种电化学腐蚀试验用低碳钢、紫铜导线的低温连接方法,其特征在于:将所述碳钢试样的上下表面加工为平行面,碳钢试样打磨的粗糙度为3.2微米以下。
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